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    medhipinku24 Posts: 1, Reputation: 1
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    #1

    Jul 15, 2012, 08:39 AM
    ask maths solutions
    In triangle ABC angle A=60,prove that BC2 =AB2 +AC2 –AB xAC
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Jul 15, 2012, 10:20 AM
    Hint: Use the cosine rule.

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